Tennis ball serving aid



FIG. 1 is a perspective view from above of the tennis ball serving aid,

FIG. 2 is a perspective view from below of the tennis ball serving aid,

FIG. 3 is a top plan view of the tennis ball serving aid,

FIG. 4 is a bottom plan view of the tennis ball serving aid,

FIG. 5 is a side elevational view of the tennis ball serving aid, and

FIG. 6 is a cross-section on line 6--6 in FIG. 5 of the tennis ball serving aid. 

The ornamental design for a tennis ball serving aid, as shown. 